Advance Window & Siding Bear Delaware
Advance Window & Siding Bear Delaware
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ABOUT US


Our Philosophy

We at Advance Window & Siding strive to obtain 100% Customer Satisfaction. We provide the finest products available, on time appointments, reasonable lead times on appointments, professional installation and timely service. Furthermore, we will listen to our clients needs and wishes. Our goal is to do anything possible to help you obtain your remodeling dreams.


Our History

Advance Window & Siding was founded in 1988 by co-owners and brothers Doug and Gary Derrick on the premise that they could provide better service before, during and after the sale. Advance started as strictly a window and door retail installation company and quickly grew into other products on the urge of enthusiastic and well pleased customers. Additional products and services were added in the order listed below.


Meet the Founders

Gary Derrick, co-owner
Gary’s background is in the design, engineering, quality control, installation and testing of windows. He developed this experience during his career with several window manufacturers.

Gary also spent several years as quality control manager of a vinyl window extrusion plant developing tolerances and standards for the various extrusions produced. His knowledge of windows and extrusions and installation techniques has been instrumental in the growth of Advance Window & Siding.

Today Gary works with the installation teams to constantly uphold and improve the installation techniques which are used at Advance Window & Siding.


Doug Derrick, co-owner
Doug currently handles the administrative functions for Advance Window & Siding. He oversees customer financing with our various lenders and works closely with our sales staff in regards to sales training, product training and accuracy of contracts.

Doug’s attention to detail coupled with his keen business sense has been invaluable to the growth of Advance Window & Siding. Doug is an avid gardener and has a passion for the sport of Disc Golf.